describe("practice-8-7",function(){
    it("字符串\"1A2B3C4D\"插入字符$后的字符串为\"$1A$2B$3C$4D\"",function() {
        var str_result = inserts_character_at_specific_pos("1A2B3C4D");
        expect(str_result).toBe("$1A$2B$3C$4D");
    });
    it("字符串\"1234ABCD\"插入字符$后的字符串为\"$1$2$3$4ABCD\"",function() {
        var str_result = inserts_character_at_specific_pos("1234ABCD");
        expect(str_result).toBe("$1$2$3$4ABCD");
    });
    it("字符串\"A1B2C3D4E5F6G7H\"插入字符$后的字符串为\"A$1B$2C$3D$4E$5F$6G$7H\"",function() {
        var str_result = inserts_character_at_specific_pos("A1B2C3D4E5F6G7H");
        expect(str_result).toBe("A$1B$2C$3D$4E$5F$6G$7H");
    });
});